The products of monoammonium phosphate containing Cr^3+resulted in disqualification,and further posed a serious threat to ecological environment and human beings.Herein,the porous adsorbent of fluor(calcium silicate)c...The products of monoammonium phosphate containing Cr^3+resulted in disqualification,and further posed a serious threat to ecological environment and human beings.Herein,the porous adsorbent of fluor(calcium silicate)composites(FCSc)was prepared by hydrothermal method using diatomaceous earth,hydrated lime and additive(NaF)as raw materials,which was characterized and used for the removal of Cr^3+from monoammonium phosphate solutions.The effects of different parameters,such as solution pH,initial Cr^3+concentration,temperature and contact time on the adsorption of Cr^3+onto FCSc were investigated in details.The results indicated that the adsorption process was in agreement with the pseudo-second-order kinetic model and Freundlich isotherm.The spontaneous and endothermic nature of the adsorption process was obtained by analyzing various thermodynamic parameters(△G0,△H0,and△S0).In addition,computational monte carlo simulations between Cr3+ions and FCSc were conducted to elucidate the adsorption mechanism.Such kind of porous adsorbent provided a potential application in the removal of impurities from monoammonium phosphate industry.展开更多
We described the case report of a patient presented with no known predisposing factor, generalized malaise with vomiting, locked jaw, perioral paraesthesia, carpopedal spasm and a positive Chvostek’s sign which resul...We described the case report of a patient presented with no known predisposing factor, generalized malaise with vomiting, locked jaw, perioral paraesthesia, carpopedal spasm and a positive Chvostek’s sign which resulted from severe electrolyte disturbance at 5 hours after use of oral sodium phosphate solution (NaPO4) as bowel preparation for colonoscopy. On presentation, she developed hyperphosphatemia and symptomatic hypocalcaemia with serum phosphate of 1.84 mmol/L and adjusted calcium level 1.67 mmol/L respectively. Her symptoms subsided after immediate intravenous calcium gluconate followed by oral calcium supplement. The electrolyte disturbances were normalized with an uneventful clinical course. The potentially fatal complications of sodium phosphate solution which commonly prescribed as bowel preparation for conventional colonoscopy could develop though previously reported as uncommon in patients without predisposing factors, and should not be overlooked. Urgent assessment and immediate correction of electrolyte disturbances are needed. Recommendations on patient selection of use of sodium phosphate to minimize risk of developing adverse events are needed to incorporate in clinical protocols.展开更多
基金the National Natural Science Foundation of China(U1633203)the Major Project of the Civil Aviation Administration of China(J2020-108)。
文摘The products of monoammonium phosphate containing Cr^3+resulted in disqualification,and further posed a serious threat to ecological environment and human beings.Herein,the porous adsorbent of fluor(calcium silicate)composites(FCSc)was prepared by hydrothermal method using diatomaceous earth,hydrated lime and additive(NaF)as raw materials,which was characterized and used for the removal of Cr^3+from monoammonium phosphate solutions.The effects of different parameters,such as solution pH,initial Cr^3+concentration,temperature and contact time on the adsorption of Cr^3+onto FCSc were investigated in details.The results indicated that the adsorption process was in agreement with the pseudo-second-order kinetic model and Freundlich isotherm.The spontaneous and endothermic nature of the adsorption process was obtained by analyzing various thermodynamic parameters(△G0,△H0,and△S0).In addition,computational monte carlo simulations between Cr3+ions and FCSc were conducted to elucidate the adsorption mechanism.Such kind of porous adsorbent provided a potential application in the removal of impurities from monoammonium phosphate industry.
文摘We described the case report of a patient presented with no known predisposing factor, generalized malaise with vomiting, locked jaw, perioral paraesthesia, carpopedal spasm and a positive Chvostek’s sign which resulted from severe electrolyte disturbance at 5 hours after use of oral sodium phosphate solution (NaPO4) as bowel preparation for colonoscopy. On presentation, she developed hyperphosphatemia and symptomatic hypocalcaemia with serum phosphate of 1.84 mmol/L and adjusted calcium level 1.67 mmol/L respectively. Her symptoms subsided after immediate intravenous calcium gluconate followed by oral calcium supplement. The electrolyte disturbances were normalized with an uneventful clinical course. The potentially fatal complications of sodium phosphate solution which commonly prescribed as bowel preparation for conventional colonoscopy could develop though previously reported as uncommon in patients without predisposing factors, and should not be overlooked. Urgent assessment and immediate correction of electrolyte disturbances are needed. Recommendations on patient selection of use of sodium phosphate to minimize risk of developing adverse events are needed to incorporate in clinical protocols.
